crc.h

来自「虚拟打印机」· C头文件 代码 · 共 41 行

/*
 *
 * crc.h
 *
 * modified from source:
 * Robert Leslie (C) 2000-2001 obtained from 
 * http://www.koders.com/c/fid0B1CBD43FD63C21C56B1B003FFAD7687FF82065F.aspx?s=ulCrc
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef CRC_H
#define CRC_H



// THE SAME CRC FOR A BLOCK OF DATA CAN BE CALCULATED BY 
// (A) ALL AT ONCE IN A SINGLE CALL WITHT THE DEFAULT ulCrcStart VALUE
// (B) IN MULTIPLE PASSES, USING THE DEFAULT ulCrcStart VALUE FOR THE FIRST SUB-BLOCK
//     AND THEN THE RETURNED RESULT FOR THE ulCrcStart FOR THE NEXT SUB-BLOCK, AND SO ON
unsigned long CalculateCrc(const unsigned char *pData, size_t szCbData, const unsigned long ulCrcStart = 0) ;

// MAY BE OF INTEREST TO SOME:
// ORIGINAL VERSION BY ROBERT LESLIE (SEE crc.cpp)
// CLAIMED THE CRC CALCULATED WAS THE STANDARD (ISO 3309) CRC-32 
// MY CHANGES SHOULD NOT HAVE INVALIDATED STANDARD COMPLIANCE.

#endif